Its not jailbroken so no, I cant sideload yet. But the EU is currently trying to force apple to allow sideloading. Should be any minute now! :)
I know about linux stuff. Running a daily driver for half a year now and a couple servers for a couple years. The apple thing is just one I bought before all that so I will use it until it breaks. I develop some low effort apps for my linux desktop so the watch should be cool for me.
The dev kit thing scares me a bit though. Says the assembled watch is not for development?